private void updateShaderMatrix() { float scale; float dx = 0; float dy = 0; mShaderMatrix.set(null); if (mBitmapWidth * mDrawableRect.height() > mDrawableRect.width()  * mBitmapHeight) { scale = mDrawableRect.height() / (float) mBitmapHeight; dx = (mDrawableRect.width() - mBitmapWidth * scale) * 0.5f; } else { scale = mDrawableRect.width() / (float) mBitmapWidth; dy = (mDrawableRect.height() - mBitmapHeight * scale) * 0.5f; } mShaderMatrix.setScale(scale, scale); mShaderMatrix.postTranslate((int) (dx 0.5f) mBorderWidth, (int) (dy 0.5f) mBorderWidth); mBitmapShader.setLocalMatrix(mShaderMatrix);}

public boolean onTouchEvent(MotionEvent event) { ViewGroup parent = getScrollableParent(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mHolderEventFlag = !CoverManager.getInstance().isRunning(); if (mHolderEventFlag) {  parent.requestDisallowInterceptTouchEvent(true);  CoverManager.getInstance().start(this, event.getRawX(),   event.getRawY(), mOnDragCompeteListener); } break; case MotionEvent.ACTION_MOVE: if (mHolderEventFlag) {  CoverManager.getInstance().update(event.getRawX(),  event.getRawY()); } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: if (mHolderEventFlag) {  parent.requestDisallowInterceptTouchEvent(false);  CoverManager.getInstance().finish(this, event.getRawX(),  event.getRawY()); } break; } return true;}